Home Network Connection Problem

I have several computers that have been networked together over years - xp, vista, win 7, win8. Everything seems to have worked. All of a sudden I am seeing a message I don't understand when I try to transfer a file to another computer - screenshot is attached.

Also may be you haven't given "Everyone" read/write permissions. Might be even more convulated in Windows 8+, I don't remember cause I gave up.

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Check your network location types (home, work or public). I've had issues in the past with windows sharing because the home group by default is more restricted if the system things you are connect to a public network. In my experience, this resolves most file sharing issues you might encounter. Also, be aware that some software solutions, including comodo firewall have options for treating network connections as public as well. Getting printer sharing to work between a windows 7 PC and a system runnin Ubuntu was surprisingly simple, despite the convoluted hoops one has to jump through to make things work. Sigh.